Hard round mattress, without spring block, base consists of 10 cm thick foam (polyurethane foam). The material is ecologically clean, flexible, durable and hypoallergenic. A very common filling, withstands heavy and long-term loads. The use of this material makes it possible to create an economical mattress model. Special ecologically clean additives prevent dust and parasites from entering the mattress. Meets all orthopedic requirements.